不甘心

Hi there,
I would like to know about this sentence: what does 不甘心 mean there?
不甘心的他打算先行逃走.
If a context is needed, there is this sentence right before.
却没想最终自己反倒被一直轻视小看的美铃最强的一刀给打成了重伤，懒惰整个头部被切成两半，妹妹所在的那部分义体直接消失了. 不甘心的他打算先行逃走, 却遭到了栞的拦截，最终被栞所击败。
Does it mean "hurt" or something?
Thanks for your answers. (that's from a visual novel, where the character shares a body with his sister for fight. 栞 and 美铃 are names of others characters).

Actually I cannot understand what the content is talking about
不甘心 as other said is mean unwilling to accept the failure. However, I cannot quite understand this paragraph...
How do one cut into half
But 不甘心的他打算先行逃走 itself you can understand it as "although he is not willing to accept the failure, he is planning to escape first."

Actually I cannot understand what the content is talking about
不甘心 as other said is mean unwilling to accept the failure. However, I cannot quite understand this paragraph...
How do one cut into half
But 不甘心的他打算先行逃走 itself you can understand it as "although he is not willing to accept the failure, he is planning to escape first."

Click to expand...

I often see some awkward translations in which they directly use the foreign language's sentence structures without modification. This could be the case.
Maybe a correct translation should be: 他虽心有不甘，但仍决定先行逃走。
Awkward translation: 不甘心的他打算先行逃走。
One significant reason is that we use attributive clauses differently in different languages, but amateur translators often don't know to change the sentence structures.

I think "Reluctantly, he planned his escape" has the same meaning as the Chinese sentence. But grammatically they are different,
不甘心的他打算现行逃走 is "He, who is reluctant, planned to escape."
And I don't think this is bad Chinese. It's just not oral. (The first sentence 却没想最终自己反倒被一直轻视小看的美铃最强的一刀给打成了重伤 is bad indeed...)

The meaning of 不甘心 was explained in the previous posts. It means "not so happy with the current failure".

I thought "reluctant" was something very similar, but maybe there are some differences... Strictly speaking, the Chinese sentence means "he was reluctant to accept the failure, and he escaped", but without a context the English sentence mostly means "he was reluctant to escape". Maybe there are some differences between the two meanings, depending on why he escaped (simply running away from failure, or seeking opportunities for future success?). I guess there is no need to be too strict with this...